I've been coming up with a lot of SCP ideas lately, some of which went straight to Fragments because I either couldn't think of complete details for the SCP or just didn't think I could pull them off. Here are a few ideas I think I can pull off, let me know if any of them sound any good:

Eye Bleach (SCP-J):
A half-full gallon (or whatever the Metric equivalent is) container of [REDACTED]-brand bleach. Making direct eye contact with the contents of the container makes anyone viewing the substance feel a painful burning sensation in their corneas in addition to a mild headache. Both these symptoms subside moments after looking away, but the viewer's memory cortex, specifically the area relevant to imagery, will have been damaged, resulting in irretrievable loss of the viewer's most recent visual memories. Plans to use this SCP in the development of a reusable amnesiac are being considered.

Warp Flies (SCP-EX):
Got the idea from the failure of "The Lonely Stray" as an SCP that's harmless but uncontainable. Basically, it's a species of fly that teleports, which makes them incredibly hard to kill or capture, though the former is still possible. In light of this, the Foundation either had to release a memetic agent to the general public that implants an almost instinctive aversion to flies and a desire to kill them on sight, or such an aversion was already present and the Foundation simply ceased official attempts to contain them since the general public didn't need to know that fly they've finally killed after five minutes of failed attempts is actually the eighth one they've encountered since the start of their attempts and not just a single very sneaky one.

The Overlord (name not final, ideas welcome):
A DVD disc with the words "██████ ██ ████ [in other words, I haven't thought of a name for it]" written on it in black marker. Disc is apparently compatible with apparently any disc-using device, such as DVD players, computers, or home game consoles. Using the disc in any of the latter devices reveals the disc contains an indie game, bearing the title written on the disc, about an unnamed protagonist battling in a post-apocalyptic city against extradimensional entities under the command of their humanoid overlord named [NAME UNDECIDED]. (playing the disc in a DVD player results in [DATA EXPUNGED] and is forbidden by O-5 mandate.) The game itself shows no anomalous properties aside from some notable design flaws (no HUD's, no menus of any sort) and the main antagonist's tendency to break the fourth wall in his monologues, seemingly addressing the player directly rather than the protagonist. After the console is turned off (the only way to exit the game due to lack of menu), the disc may be removed and a different game may be inserted and played normally, at which point the SCP's anomalous effects become apparent. At some point during gameplay, [SCP GAME ANTAGONIST'S NAME HERE]'s armada will appear within the second game's world (cutscenes depicting the event show entry via some kind of wormhole), regardless of the game's original programming, with the intent to conquer it. Gameplay continues as normal, but the focus of the game's plot will shift to fending off this new opponent, regardless of any prior story or antagonists. Of note is that [ANTAGONIST'S NAME HERE] will continue to break the fourth wall, and will also show sentience, memory of previous encounters with the player, and the ability to learn from the player's actions and adapt between game sessions, even if the console in question has been powered down. Both the console and disc in question will be "infected" the SCP, with the game able to spread its effect when used in another console and the latter able to infect other games. Despite the antagonist's expressed desire to "cross into" reality and conquer it much like the worlds of games infected by the SCP, it is unknown whether such threats should be a concern to the Foundation, though use of the SCP on a computer bears a considerable risk of containment breach and/or information leak. "██████ ██ ████" seems to have originated as freeware on a file-sharing site, which was subsequently brought offline by [REDACTED] shortly after discovery of the SCP, though there is considerable possibility of more instances of the SCP existing on the Web or the general public.

TL,DR: bizarre indie game with an infectious sentient fourth-wall-breaking antagonist that conquers the worlds of other games and has an expressed desire to do the same to ours. It is unknown if he can follow up on his threats, but his apparent internet origins mean he could still be out there and pose a considerable threat to information security, especially if he gets into a Foundation computer. Also, don't ever EVER play his disc on a DVD player. Whatever it is that happens when you do that, it doesn't end well.

Pinkie pie isn't an evil space tyrant with an army of who-knows-whats (frankly, I haven't decided what kind of minions he would have) that is apparently capable of taking over fictional worlds and is determined to do the same to ours, though it is currently unclear if he can.

I wouldn't know, I've never seen it. I've seen a couple trailers, and this thing is probably different enough since so far it is incapable of interacting with reality other than speaking to players unless it infects a DVD player. This things influence is mostly limited to devices it has infected and games played thereupon, but it might become an actual threat to security if it managed to access the internet, which it may have already done, or computer networks important to the Foundation, which hasn't happened yet.

What counts as a "disc-using device"? Would something like a CD-player work? A gramophone?
And would the anomalous effects appear in every other game? Pong? Virtual chess? Solitaire? (Addendum: The testing of SCP-XXXX on any MMO is strictly forbidden.)

I kinda meant DVD-compatible devices, but I wasn't sure if modern consoles still used DVD or a new format, so I just said "disc-compatible". Basically, any game console that can fit and run a standard DVD disc may be affected, so cartridge-based game consoles (and Gamecubes, lol) wouldn't be able to support it. Hadn't thought of what would happen if you tried running it in a CD-player.

I doubt it would have much of an effect in puzzle games since this guy is out to conquer worlds contained within games and not necessarily games themselves (though he might replace the CPU in a chess game or something). He might be narcissistic enough to make some aesthetic changes to some games like that, but that would be about it. He would go far enough to conquer the background scenery in racing games, though, and you might have to deal with racetracks being bombarded or minions wandering onto the track.

And yes, testing it on an MMO would go horribly wrong in so many ways, lol.

Eye Bleach doesn't make you crazy, it just burns your eyes and makes you forget the last thing you saw. Sorry if I failed to portray that in the article.

Also, yes, I do plan to have a test log of this guy's influence on various games. I imagine things would get interesting if he could carry over things he learned from different games, like what once was a final boss fight against him becomes a cutscene of him ripping the protagonist's head off after having infected Mortal Kombat.

I could imagine most of those would get aesthetic changes to fit his theme (maybe Minesweeper's mines would get some kind of "upgrade") and all would get a voice-over commentary by the Overlord on the skill of the player, varying from personal insults to general stuff like

Well, the whole "sentient fourth wall breaker" bit wouldn't be possible the way I meant the guy to work, but having to fight the same antagonist (who knows he's in a video game) in different game sub-types could still work.

I don't think an eye/brain bleach SCP-ification would be funny, personally. The second seems a little bland to me, but maybe it could work with the right execution. The third idea isn't half-bad. Just needs a little development and good execution, and it just might stick.

I've started working on the Overlord SCP (translation, I've just now started it) but I just realized a problem with its description; Which part would be considered the SCP: the game itself, its antagonist, or the disc containing the copy of the game the Foundation has in its possession?